Google Cloud Pub/Sub vs ksqlDB

Side-by-side comparison of Google Cloud Pub/Sub and ksqlDB to help you choose the right tool.

Feature	Google Cloud Pub/Sub	ksqlDB
Pricing	Usage-based	Free / Included with Confluent
Rating	⭐ 4.3/5	⭐ 4.3/5
Categories	streaming	streaming
Global messaging	✅	❌
At-least-once delivery	✅	❌
Dead letter topics	✅	❌
Ordering	✅	❌
Filtering	✅	❌
BigQuery subscription	✅	❌
SQL on Kafka	❌	✅
Materialized views	❌	✅
Pull & push queries	❌	✅
Connectors	❌	✅
Windowing	❌	✅
User-defined functions	❌	✅

Global messaging and event ingestion

Event streaming database for Kafka

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